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Alfa Financial Softwarewas the FTSE 250’s biggest faller on Friday after the company disclosed that one of its major customers had delayed an implementation project that would have netted the tech company millions of pounds in revenue.

Its forecasts for this year were also affected by two other potential delays to IT projects, which were expected to start in 2018 but will now be launched in 2019 due to customers changing their plans.

The company said the various problems would have a “significant” impact on its trading this year and as a result it had scaled down its 2018 revenue guidance to between £71m and £75m, compared to £87.8m last year.